Comparison of the new L3 tracking with the one used in the Tk muon reco DONE

Timeline → end of the year (TSG) 21 Dec 2016

Optimize the new L3 reconstruction: DONE

IO algorithm – ROI DONE

OI algorithm DONE

More complete set of studies on performance comparisons using MuXX OR TkMuXX as a FOM, different signal samples should be tested in order to have all possible phase spaces covered: DY, ttbar, close-by-muon , displaced muons, low pT muon (from JPsi) PENDING

OI design and testing

The important step to optimise/study is the seed generation, current implementation allows for a great number of combinations varying the number of seeds, the rescaling factors and a number of parameters, this is the default configuration as of 15/11/2016:

We check that increasing the number of seeds improves the efficiency, it somehow saturates at ~10 seeds (1 TSOS + 9 hit)

Then we checked the overlap region between the TOB and the TEC. In this region, after looping over TOB the maximum number of seeds is re-initialised to 0 and the count starts in the TEC, we narrowed the region with little impact in the efficiency (0.3%), this narrowing will be faster but we still need absolute numbers for that:

We tried using what was called Hybrid seeds (now HitlessAndHitSeeds), which is deciding whether to add a hit seed depending on the parameters of the L2: 3% gain w.r.t using only the TSOS and 5% w.r.t old L3.

We'll now focus on the HitlessAndHitSeeds combination. Now we will try to find an optimal choice of (dynamical) rescaling errors.

Lastly we check if we can make use of stereo layer hits instead of mono-hits in the TEC.

Performance results:

IO design and testing

Taking all the parameters from the tracker community. Already in the current HLT menu, as it is used for the HLT_TkMu50 path: